GTK_CSD=0 /home/chayan/Unity/Hub/Editor/2019.3.11f1/Editor/./Unity -projectPath /home/chayan/unity/DemoTest -manualLicenseFile '/home/chayan/Downloads/Unity_v2017.x.ulf'
Type this in terminal
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1st path is for Unity file it's running as ./Unity
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2nd is the project path
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3rd is the licence path
---OR---
CREATE A executable python file
#!/usr/bin/env python
import os
os.system("GTK_CSD=0 /home/chayan/Unity/Hub/Editor/2019.3.11f1/Editor/./Unity -projectPath /home/chayan/unity/DemoTest -manualLicenseFile '/home/chayan/Downloads/Unity_v2017.x.ulf' ")
and run it.